A good friend of mine, muso in a Christian church band told me of a how to deal with Atheists guide the preacher had and then proceeded to preach what was on it, not realising the consequence of telling me about the list.
God bless his ignorance.

So give your Theist friends some slack, they know not what they do; Luke 23:34, they just parrot the anti Atheist propaganda beaten into them by their preachers. Thank them for their concern and change the subject.
Unless your in the mood for a long debate that goes nowhere (there fun for me).

Theism is to believe what other people claim, Atheism is to ask "why should I".